الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
Pterygium is a triangular growth of fibrovascular tissue that extends from the conjunctiva onto the cornea. The overall prevalence rates range from 0.7-31% in various populations around the world.
Many theories have been proposed to explain the etiology of the pterygium and the pterygium is considered to be a keratoconjunctival degeneration. However, recently, the most accepted theory is that the pterygium is oonsidered to be due to limbal stem cell dysfunction.
The most difficult problem faced in the management of pterygia is their frequent and aggressive rectrrrences following surgical removal. There is no surgical procedure for pterygium removal to be universally accepted as being perfect. With subsequent recurrences, the rate of formation is quicker, the intlammatory process is more intense, the subsequent fibrosis is more severe and the recurrent pterygium becomes larger than the original one. Many workers have tried different techniques to minimize the incidence of recurrence with little or no complications. Aiming to minimize the postoperative high recurrence rate of pterygium, many adjunctive therapies have been tried includes: -irradiation, thiotepa, mitomycin C, cryo, cyanoacrylate, corticosteroids, Excimer laser and argon laser photoooagulation.